<template>
    <el-breadcrumb class="app-breadcrumb" separator="/">
      <transition-group name="breadcrumb">
        <el-breadcrumb-item v-for="(item,index) in levelList" :key="item.path">
          <span v-if="item.redirect === 'noRedirect' || index == levelList.length - 1" class="no-redirect">{{ item.meta.title }}</span>
          <a v-else @click.prevent="handleLink(item)">{{ item.meta.title }}</a>
        </el-breadcrumb-item>
      </transition-group>
    </el-breadcrumb>
  </template>
  
  <script setup>
  import usePermissionStore from '@/store/modules/permission'
  const route = useRoute();
  const router = useRouter();
  const levelList = ref([])
  const firstMenuName = computed(() => usePermissionStore().firstMenuName);
  console.log('firstMenuName: ', firstMenuName.value);
  
  
  function getBreadcrumb() {
    // only show routes with meta.title
    let matched = route.matched.filter(item => item.meta && item.meta.title);
    console.log('matched: ', matched);
    let first = matched[0]
      first = matched.at(-1)
    console.log('first: ', first);
    // 判断是否为首页
    if (!isDashboard(first)) {
      // matched = [{ path: '/index', meta: { title: '首页' } }].concat(matched)
      matched =  matched
    }
  
    levelList.value = matched.filter(item => item.meta && item.meta.title && item.meta.breadcrumb !== false)
  }
  function isDashboard(route) {
    const name = route && route.name
    if (!name) {
      return false
    }
    return name.trim() ===  firstMenuName.value
  }
  function handleLink(item) {
    const { redirect, path } = item
    if (redirect) {
      router.push(redirect)
      return
    }
    router.push(path)
  }
  
  watchEffect(() => {
    // if you go to the redirect page, do not update the breadcrumbs
    if (route.path.startsWith('/redirect/')) {
      return
    }
    getBreadcrumb()
  })
  getBreadcrumb();
  </script>
  
  <style lang='scss' scoped>
  .app-breadcrumb.el-breadcrumb {
    display: inline-block;
    font-size: 14px;
    line-height: 50px;
    margin-left: 8px;
    .no-redirect {
      cursor: text;
      user-select: none;
    }
  }
  </style>